Shelving units utilizing hybrid connection system

A shelving assembly, comprising:

• first and second side frame structures, each comprising a pair of adjacent vertical posts connected by three or more horizontal end members, including top-most and bottom-most horizontal end members, and wherein the first and second side frame structures are connected to each other by three or more pairs of horizontal cross-members, including top-most and bottom-most pairs of horizontal cross-members;
• wherein the top-most and bottom-most horizontal end members are welded to the vertical posts;
• one or more shelving units located between the top-most and bottom-most pairs of horizontal cross-members, the one or more shelving units connected by snap-fit attachment to the vertical posts;
• wherein the top-most and bottom-most pairs of horizontal cross-members are attached by threadable fasteners to the vertical posts;
• and
• wherein the horizontal cross-members include a flanged end with punched square apertures, ends of the vertical posts include punched square apertures, and each of the punched square apertures accommodates bolts with square necks;
• and
• wherein the shelving assembly is capable of being relatively rapidly assembled.